WASHINGTON – President Donald Trump will hold at least another 10 rallies before the midterm elections and his campaign will spend $6 million more on advertising, in a widening effort to defend Republican majorities in Congress.

With control of the House and possibly the Senate in play, Trump’s campaign is set to launch a $6 million TV and digital advertising blitz that will begin next week and run through Election Day, campaign aides said Tuesday.

Voters have identified the economy, health care and immigration as the top issues in Trump’s first midterm election. But election experts say the midterms will also be a referendum on the president himself. Trump has already appeared at dozens of rallies this year in Montana, Indiana, Missouri and other states with close Senate contests.

RNC Chairwoman Ronna McDaniel said in a statement that Trump "energizes our base like no one else" and said the president's support has allowed the party to build "our largest field program ever to get out the vote and defy history on Election Day."

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Supports attempt to shake hands with President Donald Trump after he lands at Lunken Airport in Cincinnati on Friday, Oct. 12, 2018. President Trump visited the Cincinnati area for a MAGA Rally at the Warren County Fair Grounds in Lebanon, Ohio, Friday. SAM GREENE/USA TODAY NETWORK

President Trump exits Air Force One after landing at Lunken Airport in Cincinnati on Friday. President Trump visited the Cincinnati area for a MAGA Rally at the Warren County Fair Grounds in Lebanon, Ohio. SAM GREENE/USA TODAY NETWORK